Apparently you can switch the diffs, i.e. side that the ring gear is on. This I would see as beneficial because with the motor on the right side, to spin in the right direction the torque of the motor is going to the right. It would be better to have the motor torque into the center of the chassis, like the nitro cars do. The gears are not spiral cut, and in this interview Tim Bump says they switched the diffs when running sensored motors. I will be doing this and testing it out.
http://www.ustream.tv/recorded/1502216